Yes, it does seem small, but the BEAM often has response times in microseconds (μs). If you are used to that and something 'blows out' to milliseconds, then I can see why alarms might get triggered.
If it's millions of calls and it's 15 additional milliseconds per call, that's going to spectacularly gum up a system that's tuned in microseconds. Even if there's no additional load, the queues all just got several thousand times longer.
If it's millions of calls and it's 15 additional milliseconds per call, that's going to spectacularly gum up a system that's tuned in microseconds. Even if there's no additional load, the queues all just got several thousand times longer.